This shirtless supporter braved the elements and Patriots fans to root for the 49ers at Gillette Stadium on Sunday night. / Jared Wickerham, Getty Images

by Chris Strauss, USA TODAY Sports

by Chris Strauss, USA TODAY Sports

There's a new (and old) leader in USA TODAY Sports' weekly NFL Power Rankings. Thanks to their prime-time punchout of New England on Sunday, the San Francisco 49ers have jumped from fourth place to claim the top spot on the list with two weeks left to play in the season.

But the Niners weren't the biggest movers on the list. The Dallas Cowboys jumped six spots to ninth with their overtime win against Pittsburgh. While Carolina and Arizona jumped five spots, several teams still in the playoff hunt made big jumps as well, with Washington and Cincinnati rising four spots into eighth and 10th place respectively.

Both the New York Giants and Chicago Bears saw rough Week 15 losses count poorly against them, with each team sinking five spots on the list. As always, the NFL Power Rankings are voted on by editors and writers from USA TODAY Sports' NFL desk.